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#1
11-30-2008, 05:56 PM
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I am not that familiar with the 560 but it sounds like the auxiliary air valve is stuck open. I believe you have an electrical one, it should close as the engine warms up. easiest test is to grab the air pipe feeding the AAV (also called a cold start air valve) and just pinch it closed with your fingers or a vice grip with some cardboard between the jaws and the rubber pipe. if the engine slows down you have found your problem
cheers barri
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61 Austin mini 67 Lotus 7 74 450sl 76 Cadillac 8.2l (501 ci) some new cars megasquirt conversion  on:djet 74 450sl http://www.mercdjetmegasquirt.britautorepair.com/ cis 76 450sl http://www.merccismegasquirt.britautorepair.com/ the best view is always from the point of no return 
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#2
11-30-2008, 06:09 PM
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Quote:
You say: easiest test is to grab the air pipe feeding the AAV (also called a cold start air valve) and just pinch it closed with your fingers or a vice grip with some cardboard between the jaws and the rubber pipe. can you explain me a bit more. where is the air pipe feeding the AAV ? and where are the jaws and the rubber pipe? thanks a lot, Jan (The Netherlands)  
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#3
11-30-2008, 06:38 PM
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Jammer Jan maar my duits in nie te goed nie!
I am unsure of the set up on the 560 but there will be a rubber air pipe coming off the throttle body or the air cleaner it will go to an electircally controlled air valve like the one in the picture (and forgive me if this is incorrect for your car) then the pipe will leave the valve and enter the block where you adjust the idle speed just after the idle speed screw. what you need to do is pinch closed the rubber pipe going into the valve with your fingers or if they are not strong enough then clamp the rubber pipe between cardboard and the jaws of a vice grips or pliers so you stop the air entering the air valve. if you can block the air flow through the valve and the engine slows down then that is your problem. the picture is of a AAV taken from a similar car to yours I hope this helps
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61 Austin mini 67 Lotus 7 74 450sl 76 Cadillac 8.2l (501 ci) some new cars megasquirt conversion on:djet 74 450sl http://www.mercdjetmegasquirt.britautorepair.com/ cis 76 450sl http://www.merccismegasquirt.britautorepair.com/ the best view is always from the point of no return
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#4
11-30-2008, 06:55 PM
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Jan I will send you a diagram of the car system if you PM me your email address but here is a small version the AAV is item Y6
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61 Austin mini 67 Lotus 7 74 450sl 76 Cadillac 8.2l (501 ci) some new cars megasquirt conversion on:djet 74 450sl http://www.mercdjetmegasquirt.britautorepair.com/ cis 76 450sl http://www.merccismegasquirt.britautorepair.com/ the best view is always from the point of no return
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#5
12-01-2008, 02:44 AM
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thank you barri. I have received it and will go to work with it.
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#6
12-01-2008, 06:04 PM
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High idle on a m117 is not fun. There is also the black box about 2 inches by 4 inches near the rear of the motor. The box is plastic and when the top is removed you can see the soldering. Many times the soldering fails. It makes contact and idle is fine when cold then when it heats up the idle goes higher. Just heating up the solder will cause it to "reconnect". Sorry no pics or better description. On a w126 it's dead center behind the firewall. Don't know the location on a 560SL.
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#7
12-01-2008, 06:24 PM
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Thanks for your reaction. I did not have the time to work on it today.
I think I know what you mean about the black box with soldering. When I am correct it is the Idle Speed Control Unit, situated behind the glove box. The high idle is not only when the engine is warm, it starts right away with high idle. But to be safe I will check the soldering in the Idle Speed Control Unit. I get back with the results in a couple of days. 
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